They are universal exchangeable & detachable bottom coil heads: can fit with eGo H2 clearomizer, protank, mini protank, protank-2 glassomizers, Kanger EVOD, and other BCCs (Bottom Coil Cartomizer). If a protank glassomizer/H2 clearomizer does not work well, you do not need to throw away the whole clearomizer(glass cartomizer), just replace a coil head, the eGo clearomizer will work like a new one. Save Money!
The coil of our protank/H2 coil head adopts high quality Nickel-chromium wire, can produce big vapor, no leak, no burnt smell.